Differences between revisions 2 and 8 (spanning 6 versions)
 ⇤ ← Revision 2 as of 2012-10-10 21:45:01 → Size: 3519 Editor: srnarf Comment: ← Revision 8 as of 2018-07-18 17:15:13 → ⇥ Size: 4386 Editor: srnarf Comment: Deletions are marked like this. Additions are marked like this. Line 2: Line 2: ||<:30%>[:PiraScheme#Mechanics: Table of Mechanics Demonstration]||<:30%>[:MEEquipmentList: List of Mechanics Equipment & Supplies]||<:30%>[:Demonstrations:Lecture Demonstrations]|| ||<30%  style="text-align:center">[[PiraScheme#Mechanics|Table of Mechanics Demonstration]] ||<30%  style="text-align:center">[[MEEquipmentList|List of Mechanics Equipment & Supplies]] ||<30%  style="text-align:center">[[Demonstrations|Lecture Demonstrations]] || Line 5: Line 6: '''Topic and Concept:''' Line 6: Line 8: '''Topic and Concept:'''  [:Linear_Momentum#ConservationOfLinearMomentum:1N20. Linear Momentum, Conservation of Linear Momentum] . [[Linear_Momentum#ConservationOfLinearMomentum|1N20. Linear Momentum, Conservation of Linear Momentum]]'''pira200 Listed''' Line 10: Line 13: * '''Floor Item:''' ME, South Wall Line 12: Line 14: attachment: mainPhoto * '''Floor Item:''' ME, South Wall{{attachment:AirTrackSpringString05-400.jpg}} Line 17: Line 21: ||<:style="width: 60%" :40%>'''Equipment'''||<:30%>'''Location'''||<:25%>'''ID Number'''|| ||<40% style="" ;text-align:center">'''Equipment''' ||<30%  style="text-align:center">'''Location''' ||<25%  style="text-align:center">'''ID Number''' || Line 20: Line 23: ||2.25 m Air Track||Floor Item: ME, South Wall|| ||||Small & Large Gliders||ME, Bay A4, Shelf #4|| ||||Springs, Strings, & Scissors||ME, Bay A4, Shelf #3|| ||||Air Hose||Floor Item: ME, South Wall|| ||||[:RedWhiteGasCart:Red & White Gas Carts]||ME, Bay B1, Shelf #2|| || ||2.25 m Air Track ||Floor Item: ME, South Wall || ||||Small & Large Gliders ||ME, Bay A4, Shelf #4 || ||||Springs, Strings, & Scissors ||ME, Bay A4, Shelf #3 || ||||Air Hose ||Floor Item: ME, South Wall || ||||[[RedWhiteGasCart|Red & White Gas Carts]] ||ME, Bay B1, Shelf #2 || || Line 27: Line 30: '''''Important Setup Notes:'''''  * This demonstration requires a supply of compressed air, permanent supplies located in rooms 2103, 2223, 2241. Line 31: Line 32: '''Setup and Procedure:''' '''''Important Setup Notes:''''' Line 33: Line 34: 1. Place air track on lecture bench, and connect the compressed air supply from the lower white panel of the [:RedWhiteGasCart:Red & White Gas Cart] to the track using an air hose. * This demonstration requires a supply of compressed air, permanent supplies located in rooms 2103, 2223, 2241.'''Setup and Procedure:''' 1. Place air track on lecture bench, and connect the compressed air supply from the lower white panel of the [[RedWhiteGasCart|Red & White Gas Cart]] to the track using an air hose. Line 38: Line 43: 1. Carefully compress the spring into a U shape, and place it between the two gliders. 1. Carefully compress the spring into a U shape, and place it between the two gliders. Line 42: Line 47: Line 45: Line 51: '''Discussion:''' '''Discussion:''' Line 47: Line 53: A basic principle of physics is the conservation of momentum, namely linear momentum in this case. Stated mathematically, '''P,,initial,,''' = '''P,,final,,'''. In this demonstration, '''P,,initial,,''' = 0. Thus, the sum of the individual momenta of our gliders must be zero after the spring is released. Mathematically, '''P,,glider 1,,''' = -'''P,,glider 2,,''' <=> m,,glider 1,, * '''v,,glider 1,,''' = -m,,glider 2,, * '''v,,glider 2,,'''. If using gliders of equal mass, the two gliders will have the same speed and travel in opposite directions. If using two gliders of unequal mass, the more massive glider will move slower than the less massive one. A basic principle of physics is the conservation of momentum, namely linear momentum in this case. Stated mathematically, '''P''',,initial,, = '''P''',,final,,. In this demonstration, '''P''',,initial,, = 0. Thus, the sum of the individual momenta of our gliders must be zero after the spring is released. Mathematically, '''P''',,glider 1,, = -'''P''',,glider 2,, <=> m,,glider 1,, * '''v''',,glider 1,, = -m,,glider 2,, * '''v''',,glider 2,,. If using gliders of equal mass, the two gliders will have the same speed and travel in opposite directions. If using two gliders of unequal mass, the more massive glider will move slower than the less massive one. Line 50: Line 56: || {{attachment:AirTrackSpringString01-250.jpg}} || {{attachment:AirTrackSpringString02-250.jpg}} || {{attachment:AirTrackSpringString03-250.jpg}} || {{attachment:AirTrackSpringString04-250.jpg}} |||| {{attachment:AirTrackSpringString06-250.jpg}} || {{attachment:AirTrackSpringString07-250.jpg}} || {{attachment:AirTrackWithGliders-250.jpg}} || {{attachment:AirHose03-250.jpg}} |||| {{attachment:AirHose02-250.jpg}} || {{attachment:AirHose01-250.jpg}} || {{attachment:InelasticGliders-02-250.jpg}} || {{attachment:ElasticGliders-02-250.jpg}} |||| {{attachment:SpringsStrings01-250.jpg}} || {{attachment:SpringsStrings02-250.jpg}} || {{attachment:SpringsStrings04-250.jpg}} || {{attachment:SpringsStrings03-250.jpg}} || Line 51: Line 61: ||attachment: photo||attachment: photo||attachment: photo||attachment: photo|| Line 54: Line 65: * [https://www.youtube.com/user/LectureDemostrations/videos?view=1 Lecture Demonstration's Youtube Channel] * [[https://www.youtube.com/user/LectureDemostrations/videos?view=1|Lecture Demonstration's Youtube Channel]] Line 58: Line 70: * [https://en.wikipedia.org/wiki/Momentum#Conservation Conservation of Momentum - Wikipedia] * [[https://en.wikipedia.org/wiki/Momentum#Conservation|Conservation of Momentum - Wikipedia]] Line 60: Line 72: [:Instructional:Home] [[Instructional|Home]]

# Spring-Apart Air Track Gliders, 1N20.20

Topic and Concept:

pira200 Listed

Location:

• Floor Item: ME, South Wall

Abstract:

Using a scissors, cut a string holding a compressed spring between two air gliders initially at rest.

 Equipment Location ID Number 2.25 m Air Track Floor Item: ME, South Wall Small & Large Gliders ME, Bay A4, Shelf #4 Springs, Strings, & Scissors ME, Bay A4, Shelf #3 Air Hose Floor Item: ME, South Wall ME, Bay B1, Shelf #2

Important Setup Notes:

• This demonstration requires a supply of compressed air, permanent supplies located in rooms 2103, 2223, 2241.

Setup and Procedure:

1. Place air track on lecture bench, and connect the compressed air supply from the lower white panel of the Red & White Gas Cart to the track using an air hose.

2. Place two gliders on the track, approximately centered.
3. Turn on the air supply by opening the valve located on the lower white panel of the cart.
4. If the gliders seem to slide in one direction, this is most likely due to the track being unlevel. Adjust the set screws until this no longer occurs. It is a good idea to do this ahead of time.
5. Using a small section of string, make a tied loop, and hang it of a hanger on each glider so that the two gliders are connected.
6. Carefully compress the spring into a U shape, and place it between the two gliders.
7. When ready, cut the string with the scissors to release the potential energy.

Cautions, Warnings, or Safety Concerns:

• Make sure you are using compressed air (white panel) and NOT methane gas (red panel) which is extremely flammable!
• The spring can sometimes fly off toward the demonstrator's face. Either wear safety glasses or look away during cutting.

Discussion:

A basic principle of physics is the conservation of momentum, namely linear momentum in this case. Stated mathematically, Pinitial = Pfinal. In this demonstration, Pinitial = 0. Thus, the sum of the individual momenta of our gliders must be zero after the spring is released. Mathematically, Pglider 1 = -Pglider 2 <=> mglider 1 * vglider 1 = -mglider 2 * vglider 2. If using gliders of equal mass, the two gliders will have the same speed and travel in opposite directions. If using two gliders of unequal mass, the more massive glider will move slower than the less massive one.

This demonstration can be performed with both the inelastic and elastic gliders (see photos for string placement).

Videos:

References:

fw: Spring-Apart_Air_Track_Gliders (last edited 2018-07-18 17:15:13 by srnarf)